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 ###Instrução: Qual é o circuito que teve um evento cancelado?
 ###Tabelas: CREATE TABLE top-performing_clubs_in_the_prime_league (top-performing_clubs_in_the_prime_league_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Champions INT, Runners-up INT, 3rd-Place INT, 4th-Place INT) CREATE TABLE top_grossing_films_international (top_grossing_films_international_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Title VARCHAR, Studio VARCHAR, Director VARCHAR, Gross VARCHAR) CREATE TABLE 1966_season_-_finished_1st_54pts_out_of_19 (1966_season_-_finished_1st_54pts_out_of_19_id AUTO_INCREMENT PRIMARY KEY, Rider VARCHAR, Matches INT, Rides INT, Bonus Pts INT, Total Points INT) CREATE TABLE composition_of_the_15th_seanad (composition_of_the_15th_seanad_id AUTO_INCREMENT PRIMARY KEY, Administrative Panel INT, Agricultural Panel INT, Cultural and Educational Panel INT, Industrial and Commercial Panel INT, Labour Panel INT, National University of Ireland INT, University of Dublin INT, Nominated by the Taoiseach INT, Total INT) CREATE TABLE race_calendar (race_calendar_id AUTO_INCREMENT PRIMARY KEY, Race Title VARCHAR, Circuit VARCHAR, City / State VARCHAR, Date VARCHAR, Winner VARCHAR)  
SELECT Circuit FROM race_calendar WHERE Winner = event cancelled